Improvement in steam-injectors



UNITED STATES PATENT OFFICE.

DAVID FERGUS, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN STEAM-INJECTORS.

Spccication forming part of Letters Patent No. 162,368, dated April 20, 1875; application iled October 3, 1874.

the accompanying` drawings, which form a part of thispeciication, in which- Figure l is a vertical central section, and Fig. 2 a perspective view of a detail.

The object of my invention is to simplify the construction and lessen the cost of steamboiler injectors, and also to do away with the noise usually made at the overllow-pipe when a vacuum has been created.

My invention accordingly consists, first, in providing a check-valve within the swivel;

second, in the provision of flat valves in the overow-pipe.

Referring to the accompanying drawing, A shows an injector, the body of which `is coustructed substantially in accordance with the injector patented May 26, 1874, by Ryner7 Farley,and Fergus. B represents a swivel, by which the injector is usually connected with the boiler. b is a bridge, located within the swivel B, and forming a guide or support for the rod or stem of the sliding check-valve C. Said check-valve is formed of the stem c, shoulder c1, double-cone body c2, and prongs c3. D represents a bush screwed into the swivel B and forming a seat at el for the valve C. E is the nut by which the swivel and injector are held together.

When the injector is in operation the check C will be forced back until its shoulderl cl impinges upon the bridge b, allowing the water to pass between the prongs c3 into the boiler. When, however, the injector is not feeding, the boiler pressure will force the valve C to its seat d, cutting off all communication between the boiler and injector. The injector may thus at any time be removed for repairs or other cause, the swivel and check remaining in position in the boiler, shutting oft' the pressure of the latter.

F shows the overflow-pipe, within which is a hollow stein, f, having lateral openings fl f1, closed by {lap-valves f2f2. The end of the stem f is closed by a plug', Gr, beveled at the openings f1 f1 so as to form a A-ridge for the purpose of evenly dividing the overflow-water, so as to allow it to escape easily from the overflow-pipe, the valve openings being insufticient in size to allow all the water to pass through one with the requisite facility in case of a large overtiow.

As soon as a vacuum is created by the injector the overflow ceases and a suction of air through the openings flfl begins. The valves f2 f2 at once close, shutting ot't' the suction, and thereby preventing the disagreeable noise heretofore produced.

I have illustrated my improvements, as applied to the patent of Ityner, Farley, and Fergus, above mentioned, but they are equally applicable to all other injectors with which I am acquainted.

Though I have described a somewhat peculiar construction of the check C, I do not limit myself thereto, but reserve the right to substitute any other valve which may answer the purpose in view, this part of my invention covering broadly the employment ot' a checkvalve within a swivel in. any and all cases whatever.

I am well aware that, broadly considered, a check-valve, in combination with an injector, is not new; that, for instance, a check-valve has been used in the body of injectors in one case, and in a globe screwed to the swivel in the other. But in the rst case, c'. c., where the check is in the body ot' the injector, when the latter is unscrewed from the boiler, for repair or other cause, leakage will occur at the swivel. By placing the check, however, within the swivel, the injector body may be unscrewed from the boiler without occasioning any leakage ot' the latter. So. too, in the second case, where the check is placed within the globe, it requires an extra part, viz, the globe, which, by my construction, is avoided, thereby effecting an economical result.

I am also aware that' the employment of a valve in the overflow-pipe of an injector is not new, per sc. Consequently, I limit my claim improved results are obtained.

flap-valves fzfz, in preference to others, because while operating eftectually to prevent suction, they offer no obstruction to the escape of water, opening easily from the inside, and are not at all liable to get out ot' order. This forin ot' Valve also allows a division of the Water-current, issuing in two streams, without obstruction, through the lateral openings in the hollow plug to which said valves are attached.

What I claim as my invention is- 1. In combination with a swivel, B, acheckvalve located within. such swivel, substantially as shown and described.

2. The hollow stem f, located in the overhave hereunto set my hand this 22d day of Y September, 1874.

DAVID FERGUS. Witnesses:

FRANK HARTMAN, JNO. A. BELL. 

